<wicket:extend xmlns:wicket="http://wicket.apache.org">
    <div wicket:id="window"/>
    <div class="row" style="margin-bottom: 25px">

        <button wicket:id="newEvent" class="btn no-border btn-primary btn-sm">
            <i class="icon-bullhorn"></i>
            <wicket:message key="new.event"/>
        </button>
    </div>
    <div wicket:id="tabs" class="room-details">

    </div>
</wicket:extend>